Arc-lamp.



C. A. HALVORSDN, En. ARG LAMP.

APPLIQATION FILED was, 1809.

1,083,210. Patented De@ so,

n (dm/ Witnesses '0X fayyf c. A. B.. HALVORSON, JR.

Hit' g C. A.' B. HALVORSON, JR.l

ARG LAMP.

APPLICATION FILED AUG. a, 1909.

1,083,21 O. Patented Dee. 3o, 191s.

4 SHEETS-SHEET 3.

Witnesses: Inventor:

l I Cromwell AvBHalvQrson Jr. /)M V C. A. B. HALVORSON, JR. ARG LAMP.

APPLIOATION FILED Amm, 1909.

Patented'Deo. 30, 1913` 4 SHEETS-SHEET 4.

auf'

l Wvtnexsses I f rI -Tjn/erwJcJo-T:

I Cvomwel A.B. Hal-vor'son Jr..

UNITED sTATEs PATENT oEEIoE CRM'WELL A.. B. ELXLVORSON, JR., OF LYNN, MASSACHUSETTS, ASSIGNOR T0 GENERAL ELECTRIC COMPANY, A CORPORATION OF NEW YORK.

ARC-LAMP.

Specification of Letters Patent.

Patented Dee. 30,1913.

' Application led August 3, 1909.v Serial No. 511,009.

. which the following is a speciiication.

` This invention relates to electric are lamps, and its object is to provide a lamp of simple and inexpensive construction, but one which is etlicient and of long life.

The invention consists in a lamphaving a large upper positive electrode, vand two smal-ler lower negative electrodes abut-ting against each other at an acute angle, and urged upwardly bya single spring, whereby the pressure on both electrodes will be the same and their rate of feed will be uniform.

As the point of contact of said negative electrodes remains practically stationary, the are is struck by simply lifting the positive electrode, and the length of the are, beiiig determined vby the distance betweensaid upper and lower electrodes, will remain constant.

The several features of construction are clearly shown in the accompanying 'drawings, in which- Figure 1 isa front elevation of the lamp,

partly in section; Fig. 2 is a' perspective view of a portion of the spark gap and' cut out; Fig. 3 is an edge elevation of the lamp,

-partly in section; Fig. 4t is a front elevation of tlie upper electrode and its supportingr as best shown in- Fig. 3. At the center of the platform is an opening surrounded by the upright' chimney et to carry oif the fumes rising from the are. The canopy and the globe are supported on the platform, but are not shown in the drawings.

The lower negative electrodes 5 are pref- 'erably composed of magnetite or some other compound producing a flaming or luminous arc.` They are slipped into tubular holders (3 arranged at an angle to each other, so that the upper ends of the electrodes abut,i a's shown in Fig. l. The holders are rigidly secured to the end of a depending bracket 7 whose upper end is bolted to the Wall of the recess 2, but is thoroughly insulated therefrom by the washers 8 of asbestos or otherrefractory insulating material. Each holder ii slotted longitudinally to admit a follower,

preferably the lever 9, which bears against the lower end of the electrode. The levers are fulcrumed at 10 between two bars 11 connecting the holders, and are connected byl a link 12, pivoted to one lever at 10 above its fulcrum andto the other one at 10 below its fulerum and serving to equalize their movements and cause them torise and fall together. Affension spring 13 connects the lower ends of said levers through the intermediary of link 1 2, and urges their free ends upwardly in the holders. The electrodes 5 are thus maintained in close contact and are icd upward as theyburn away sothat their meeting point is stationary and always at the 'saine distance from the reflector. Furthermore, as the spring pressure on one electrode is always the same as that on the other, there vis no tendency for one to ride past the other, as would be likely to occur if each electrode was driven by a separate spring. l regard this construction as a valuable and important feature of my lamp.

'The upper or positive electrode 14 1sl of larger cross section than the negative and may be composed of carbon, copper or other good conductor., It is attached at its upper end to a trans'ferse Wide and thin. bar l5 whose ends are received in jaws -at the ends 0I" a U-shaped trame A16. Cotter-pins 17 may be thrust through said jaws and bar to fasten .them together. The frame 16 is secured to a tange 18 on a plate 19 which has ears 20 -hingedupon a pin 21 passed' ithebracket 7. Insulation 22 is interposed between the flange and the frame. A connecting-rod 23 is pivotei to the iiange by a pin 24 and is also pivotally attached to one end of a yoke-shaped lever 25'fulcrumed on the chimney, which it surrounds. The other end of said lever is pivotally connected to the movable core 26'ot` a solenof i 24 mounted on the top of the platform in the 'iom the Contact 82 and eie ii, thus eim'w iie Contact plates 32 adepteii jpeci imm when euiieiit is Y it puiie (imm it 1mg im are bei/Ween miei eieetie iewei: enea, es indicated itrede ami Fig. il

.iii oiciei te previ a yeti 3() Wi/lien is suspended from miziteiel extension of the ievei; 25 and passes down thiough the platform i. Secured te the jundei side of seid platform and iiisiiietec'i therefrom by tile Washer 31 :we two metal* by the bridging contact 2&1 Contact oiate "hes a, binding extending up through the piatifoi'm and insulated therei Gm. The iiie terminais are 'connected with these binding seiews by the conducteis and one of seid iine teiminais is aise connected by a, eonuetoi @l with the binding screw 3i which is attached to the biacket i' unifying iowei eiectiodes'.- The bindn ing scew 33, connected to the. @their line terminei is else connected by Conductor e with the soieiieid. 27 Whose @their teiffmifiei is @Generated by the iiexibie eonducto' d 'with einge? 36 extening from one ene'. of the bai' 15 up through en opeiiing in the plat-- form, seidepenirig being provided with insiiintiiig bushing 37.

The operation of the eut-out deviee is foiiows:A During the normai operation the lamp, when the lower eieetede's 5 abut against eeeii other7 the eyeing :tace oi" the two eieetrodes is stetieiiei'y and, is et Such an eievation. that the eieetiede i4, when it comes into eieeeement with the abutting eiectiodes dees not descend euieientiy `te bring the Contact 29 into engagement ivith the contacts S241 When, hotte/velg the ilseeii ptioii ci* the iowei. eieetiocies has 'been een iimeei, the ie'vezs 9 enge'e the ends ofthe siete im;1 which they operate and ne iei'ei impei t'iie 'electrodes upwafdiy, the eieeti'ocies .n0 longe? ibut against each other', with. eeeiisequelfiee that, with a furthei cen-- exemption ai the eieetiecies, their aiming feces are iewerecL New, when the iippezf electrode le comes into engagement with the lower eieetiodiee94 the amelie is sufiicieiitiy lowered te bring the Contact 29 into engage ment with the stationary contacts 82 ami thus eut-eut the Arms 389 of resilient metal iepenfi slightly indented te ifeceive eiiis @i two eeppei' plugs il which slipped. into be connected.

iiieeiimiissm imk save tile gie soieiioi by iii-ting the A eieffainde5 and 'when the upper positive eleetrode'is made O15-copper or @they non-eensuming metterti, the iegth of tile is existent., The eiiiiimey is fiiieetiy 3,170@ the elfe md l 'iecie the fe @me is nothing t0 Kipe el the iimes from the iig eieetiofieL-L in. eceei'cizz'nee 'with the provisions of the patent stqiv'es, L" have deselfioed the Drineipi'e el epe tion ef my invention together Witiii the epemtus which new consider to repiesent the best eiiibociiment thereof: but Ii. eesire te have it understand l eppamtiie shown is ei `31 iiustietivei that the invention een' 'fue eeii'ieci out by @they meme.

ifi-1.1 v` Y what .L @eine es new me (leslie te secure by Lette@ paient ie United' States5 isz- J' si platform con fiewiyrv'ai'diy, ref Wfl pisite @it7m j "recess, a, U

fe, a, bi1-r v :7-1 I f A ne enne 0i mie, im eieetieee mounted en seid bei; anti i seienoif'i :i seid seeeifi ieeess for il. giate, frame and eiectreaie.

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